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    AIR 9 Mountain Bike

    WFO e9

    Downhill capable, no lift required

    Park the shuttle truck, skip the lift

    This 180mm-travel bike defies categorization and opens new realms of terrain.

    Your access to the rowdiest terrain, steep backcountry lines, and local chunder just got a lot better. With aggressive geometry, 180mm suspension travel, a coil spring, and Bosch Gen 4 drive system, the WFO e9 is ready to punch your ticket to the top of any trail and capably carve its way down, no matter how gnarly.

    All in on aluminum

    As on the RIP e9, the WFO e9 chassis is welded from 6061 aluminum frame mated to a one-piece motor mount. The intricately shaped motor mount cleverly houses upper and lower pivots, plus the lower shock mount, for a rock-solid foundation. Forged frame end links and dropouts bring added strength and the pivots ride on Enduro Max Black Oxide bearings for smooth, long life performance.

    Torque sensitive, zero-lag power delivery comes courtesy of Bosch and the Gen 4 Performance CX drive system. Powered by a 625wh battery, this system delivers miles of reliable, predictable pedal assist in the most challenging conditions.

    Supple yet stable coil shock suspension

    Offering up 180mm of coil-sprung travel, the Horst link 4-bar suspension system offers ideal behavior in a pedal assisted application. Every parameter of this proven design was adjusted to achieve Niner’s signature, supple yet stable suspension behavior. The leverage ratio, shock length, stroke, orientation and mounting location are tuned to Niner’s specification. And because the rocker arm rotates the upper shock bushing far more than the lower, we added bearings to the upper arm and oriented the trunnion mount shock with the damper body on top.

    Best of both wheel sizes

    Rounding out our WFO e9 is a “mullet” style, 29er front/27.5+ rear wheel setup. The smaller rear wheel keeps the chainstays short for snappy trail manners and offers up massive traction.

    In short, you’re free. Free to pedal instead of shuttle. Free to roam, explore, and ride whatever you want, whenever you want, with nothing holding you back other than your imagination.

    Close up on the AIR 9 Mountain Bike

    Welded 6061-T6 aluminum

    Lightweight, stiff, and strong, with forged yokes and 1-piece alloy motor housing. 
    Close up on the AIR 9 Mountain Bike

    Bosch motor

    Bosch Performance Line CX motor delivers smooth, predictable power. Read More
    Close up on the AIR 9 Mountain Bike

    Power Tube 625 battery

    625wh external downtube battery offers easy access and robust range of 80km (avg).
    Close up on the frame of the AIR 9 Mountain Bike

    180mm suspension travel

    Coil-sprung, Niner tuned Horst-link suspension with “right side up” trunnion mount takes full advantage of bearings in rocker link.
    Close up on the frame of the AIR 9 Mountain Bike

    Enduro Max Black Oxide pivot bearings

    The smoothest, most durable bearings in the industry. Made for life. Read More 
    Close up on the frame of the AIR 9 Mountain Bike

    Mixed wheel size

    Best of both wheel-size worlds, with 29” front and 27.5+” rear.
    Close up on the frame of the AIR 9 Mountain Bike

    Integrated protection

    Bash guard under motor protects against impacts. 

    Specifications

    Durable, trail-ready parts round out the USA-spec WFO e9 parts kit. With Rockshox suspension, SRAM drive train and SRAM brakes, it's ready for heavy duty and trouble-free trail rides.

    • Rockshox Super Delux Coil Select R rear shock
    • SRAM Guide RE Brakes and 200 mm rotors
    • SRAM SX Eagle drivetrain
    Available frame sizes S, M, LAvailable colorsBlack
    MOTORBOSCH GEN4 PERFORMANCE LINE CX 20MPHFRAMENINER WFO E9 180MM TRAVEL
    DISPLAYBOSCH PURIONFORKROCKSHOX YARI RC 180MM 
    SHOCKROCKSHOX SUPER DELUXE COIL SELECT R 205X65MM TRUNNION (S-350LB, M-400LB, L-450LB)BATTERYBOSCH POWERTUBE 625WH
    FRONT WHEELSTANS NOTUBES FLOW D 29, FORMULA CL-811 HUB 110X15MM FRONTTUBES/SEALANTTUBES
    FRONT TIREMAXXIS MINION DHF 3C/EXO/TR 29X2.5WT FRONTREAR WHEELSTANS NOTUBES FLOW D 27.5 , FORMULA ECT-148S HUB 148X12MM REAR
    BRAKESSRAM GUIDE REREAR TIREMAXXIS DHF 2C/EXO/TR 27.5X2.8WT REAR
    BRAKE ROTORSSRAM CENTERLINE 200MM CENTERLOCKBRAKE LEVERSSRAM GUIDE RE
    FRONT SHIFTERN/ACHAINSRAM SX EAGLE 12SP
    FRONT DERAILLEURN/AREAR SHIFTERSRAM SX EAGLE 12SP
    CASSETTESRAM PG1210 EAGLE 11-50TREAR DERAILLEURSRAM SX EAGLE 12SP
    BOTTOM BRACKETN/ACRANKSETPRAXIS BOSCH G4 ISIS 165MM WITH SRAM DM EAGLE RING 36T
    SEATPOSTKS LEV SI (S-100MM, MD-125MM, LG-150MM)SADDLENINER CUSTOM TR WITH CR-MO RAILS, PRINTED NINER GRAPHIC
    STEMRACE FACE AEFFECT R, 35MM CLAMPHANDLEBARRACE FACE AEFFECT R 780MM WIDE, 20MM RISE, 35MM CLAMP
    GRIPSNINER GRRRIPS L/O NYLON FLANGEDHEADSETNINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6 | ZS56/40
    APPROX. WEGHT55.5 LBS/ 25.2 KG

    Durable, trail-ready parts round out the EU-spec WFO e9 parts kit. With Rockshox suspension, SRAM drive train and SRAM brakes, it's ready for heavy duty and trouble-free trail rides.

    • Rockshox Super Delux Coil Select R rear shock
    • Magura MT5 brakes with 200 mm rotors
    • SRAM SX Eagle drivetrain
    Available frame sizes S, M, LAvailable colorsBlack
    MOTORBOSCH GEN4 PERFORMANCE LINE CX 20MPHFRAMENINER WFO E9 180MM TRAVEL
    DISPLAYBOSCH PURIONFORKROCKSHOX YARI RC 180MM 
    SHOCKROCKSHOX SUPER DELUXE COIL SELECT R 205X65MM TRUNNION (S-350LB, M-400LB, L-450LB)BATTERYBOSCH POWERTUBE 625WH
    FRONT WHEELSTANS NOTUBES FLOW D 29, FORMULA CL-811 HUB 110X15MM FRONTTUBES/SEALANTTUBES
    FRONT TIREMAXXIS MINION DHF 3C/EXO/TR 29X2.5WT FRONTREAR WHEELSTANS NOTUBES FLOW D 27.5, FORMULA ECT-148S HUB 148X12MM REAR
    BRAKESMAGURA MT5REAR TIREMAXXIS AGGRESSOR 2C/EXO/TR 27.5X2.8WT REAR
    BRAKE ROTORSMAGURA STORM 203MM CENTERLOCKBRAKE LEVERSMAGURA MT5
    FRONT SHIFTERN/ACHAINSRAM SX EAGLE 12SP
    FRONT DERAILLEURN/AREAR SHIFTERSRAM SX EAGLE 12SP
    CASSETTESRAM PG1210 EAGLE 11-50TREAR DERAILLEURSRAM SX EAGLE 12SP
    BOTTOM BRACKETN/ACRANKSETPRAXIS BOSCH G4 ISIS 165MM WITH SRAM DM EAGLE RING 36T
    SEATPOSTKS LEV SI (S-100MM, MD-125MM, LG-150MM)SADDLENINER CUSTOM TR WITH CR-MO RAILS, PRINTED NINER GRAPHIC
    STEMRACE FACE AEFFECT R, 35MM CLAMPHANDLEBARRACE FACE AEFFECT R 780MM WIDE, 20MM RISE, 35MM CLAMP
    GRIPSNINER GRRRIPS L/O NYLON FLANGEDHEADSETNINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6 | ZS56/40
    APPROX. WEGHT55.5 LBS/ 25.2 KG

    Niner Bikes reserves the right to change bike assembly specification at any time without notice. While we make every effort to publish accurate build specs, substitutions and/or running changes may be made without warning.

    Tech specs for the AIR 9 mountain bike